Gamma-irradiation-induced surface traps in polymethyl methacrylate: Evolution and impact on insulation performance

IF 1.4 3区物理与天体物理 Q3 INSTRUMENTS & INSTRUMENTATION

Nuclear Instruments & Methods in Physics Research Section B-beam Interactions With Materials and Atoms Pub Date : 2025-08-01 DOI:10.1016/j.nimb.2025.165817

Yawei Zhou , Shi Yang , Yixiang Hu , Deyu He , Aixu Zhong , Jiahui Yin , Weixi Luo , Chunqing He

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引用次数: 0

Abstract

The evolution of gamma-irradiation-induced surface traps and their impact on the insulation properties of polymethyl methacrylate (PMMA) were investigated. Gamma irradiation was carried out at room temperature using a ⁶⁰Co source, with irradiation doses are 0.1, 1.0, 10, 100 kGy, respectively. The surface morphologies, free volume, trap distribution, and vacuum surface flashover properties of both pristine and gamma-irradiated samples were measured. Cracks and holes appeared on the surface of PMMA samples successively after gamma irradiation. Both cross-linking and degradation reactions occur simultaneously during the irradiation process. Gamma irradiation alters PMMA surface microstructure, directly affecting its vacuum insulation performance via trap formation. Appropriate gamma irradiation is an effective method to improve the vacuum surface insulation properties of PMMA. Positron annihilation lifetime spectroscopy is proposed as a new method to characterize the surface trap properties of dielectric materials.

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γ辐照诱导的聚甲基丙烯酸甲酯表面陷阱：演变和对绝缘性能的影响

研究了γ辐照诱导表面陷阱的演变及其对聚甲基丙烯酸甲酯（PMMA）绝缘性能的影响。采用60Co源在室温下进行γ辐照，辐照剂量分别为0.1、1.0、10、100 kGy。测量了原始样品和γ辐照样品的表面形貌、自由体积、陷阱分布和真空表面闪络特性。经γ辐照后，PMMA样品表面相继出现裂纹和孔洞。在辐照过程中，交联反应和降解反应同时发生。伽马辐照改变PMMA表面微观结构，通过形成陷阱直接影响其真空绝缘性能。适当的辐照是提高PMMA真空表面绝缘性能的有效方法。正电子湮灭寿命谱是表征介电材料表面阱特性的一种新方法。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Nuclear Instruments & Methods in Physics Research Section B-beam Interactions With Materials and Atoms 物理-核科学技术

CiteScore

2.80

自引率

7.70%

发文量

231

审稿时长

1.9 months

期刊介绍： Section B of Nuclear Instruments and Methods in Physics Research covers all aspects of the interaction of energetic beams with atoms, molecules and aggregate forms of matter. This includes ion beam analysis and ion beam modification of materials as well as basic data of importance for these studies. Topics of general interest include: atomic collisions in solids, particle channelling, all aspects of collision cascades, the modification of materials by energetic beams, ion implantation, irradiation - induced changes in materials, the physics and chemistry of beam interactions and the analysis of materials by all forms of energetic radiation. Modification by ion, laser and electron beams for the study of electronic materials, metals, ceramics, insulators, polymers and other important and new materials systems are included. Related studies, such as the application of ion beam analysis to biological, archaeological and geological samples as well as applications to solve problems in planetary science are also welcome. Energetic beams of interest include atomic and molecular ions, neutrons, positrons and muons, plasmas directed at surfaces, electron and photon beams, including laser treated surfaces and studies of solids by photon radiation from rotating anodes, synchrotrons, etc. In addition, the interaction between various forms of radiation and radiation-induced deposition processes are relevant.